12 



PHYSIOGRAPHY. 



Libethenite Limonite. 



Lustre resinous. Color olive-green, generally dark. 

 Streak olive-green* Translucent on the edges. 

 Brittle. Hardness =4-0. Sp. gr. =3-6 . . . 3-8. 



1. Before the blow-pipe, on the first impression of heat, it fuses into a 

 brownish globule, which, by further action of the heat, extends on the 

 surface of the charcoal, and acquires a reddish grey, metallic lustre, and 

 finally gives, at the centre, a small globule of metallic copper. 



2. Analysis. 



By BERTHIER. 



Oxide of copper - - - - - - 63-9 



Phosphoric acid 28-7 



Water 7-4 



3. It occurs engaged in cavities of Quartz, associated with Yellow 



Copper Pyrites, in a bed, in primitive rocks, at Libethen, near Neusohl, 



Hungary ; also at Gunnis lake mine in Cornwall. 



LIEVRITE. (See Yenite.) 

 LIMBILITE. (See Peridot.) 



LIMONITE. Prismatic Iron-Ore. MOHS. 



Primary form. Right rhombic prism. M on M' = 

 130 40'. 



Secondary form. 



Fig. 280. 



The crystals are compressed parallel with the shorter di- 

 agonal of the prism, so as to give an undue extension to the 

 planes o o of the above figure. 



